I installed the gen 4 ecu with the bundle of wires in an early 2020 Model 3. I also did the software re-install; twice The car still says that CCS capability is "Not available". What could be wrong? The car doesnt have any error messages and seems totally normal. As if I didn't do anything.
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Make sure you have the right Gen4 ECU. Not all Gen4 ECUs support CCS. It must be part number 1537264-00-B. If it is, inspect each connection at the ECU excluding the one from the bundle of wires to make sure there are no damage to the pins or socket and make sure connectors are locked in. If still not okay, then you probably have a defective ECU. Try another one as the CCS feature is strictly from the ECU with part number 1537264-00-B. The bundle of wires only makes sure the charging port sensors can be detected by the ECU and it is not related to the enabling of CCS.